diff --git a/main.go b/main.go
index 8b893cd..d512c2c 100644
--- a/main.go
+++ b/main.go
@@ -169,8 +169,9 @@ func setOutput(k, v string) (err error) {
 			err = cErr
 		}
 	}()
+	envMsg := fmt.Sprintf("%s=%s", k, strings.ReplaceAll(v, "\n", "\\n"))
 
-	if _, err := envFile.Write([]byte(msg)); err != nil {
+	if _, err := envFile.Write([]byte(envMsg)); err != nil {
 		return errors.Wrap(err, "write to env file")
 	}